Sachusetts



' H. B. WALMSLEY SET SCREW PROTECTOR.

Patented Mar. 3,1891.

(Nd Modei.)

Usirrnn STATES rFrcE.

ArnN T HARRY l3. IVALMSLEY, OF BEVERLY,

ASSIGNOR OF ONE-HALF TO CHARLES H. IVARREN, OF LYNN, AND CHARLES II KING, OF SIVAMPSCO' I, MAS- PROTECTOR.

SPECIFICATION forming part of Letters Patent No. 447,742, dated March 3, 1891.

Application filed September 4, 1890. Serial No. 363,948. (No model.)

To (.tZZ whom it may concern:

Be it known that I, HARRY B. IVALMSLEY,

a citizen of the United States, and a resident of Beverly, in the county of Essex and State 5 of Massachusetts, have invented new and usef ul Improvements in Set-Screw Protectors, of which the following, taken'in connection with the accompanying drawings, is a specification.

This invention relates to improvements in set-screw protectors on pulley-hubs, collars, couplings, shafting, and similar devices for the purpose of guarding and shielding the setscrew head, so as to prevent accidents caused by the clothing of operatives or objects being caught by the projecting head of the set screw, by which the revolving pulley, &c., is attached to its shaft, as will hereinafter be more fully shown and described, reference being had to the accompanying drawings, where Figure 1 represents a bottom plan view of my improved set-screw protector. Fig. 2 represents a longitudinal section thereof on the line X X in Fig. 1, showing the device as secured to the set-screw head of a pulley-hub. Fig. 3 represents a cross-section on the line Y Y, shown in Fig. l; and Fig. 4. represents the device as applied to a pulley or wheel.

Similar letters refer to similar parts whereverthey occur on the different parts of the drawings.

A represents a pulley having its hub A secured to a shaft B in the usual manner by means of a set-screw 0, provided with a head projecting beyond the periphery of the pulley-hub, as shown. In connection with such set-screw I use my improved guard or protector, which is constructed as follows: It consists of a flexible hollow ball, bulb, or bag D, preferably made of india-rubber, said yielding-protector having a base D, adapted to fit against a portion of the periphery of the hub A, as shown. d is a preforation made in the base portion D, which perforation is made of a size about equal to the diameter of the 5 screw 0 and less than the size of the head 0',

so that the protector may be placed in position on the set-screw simply by crowding the perforated base portion over the head 0, causing the edge cl of the base D adjacent to the perforation d to close around the screw 0 below its head 0, as shown in the drawings, by which arrangement and operation the protector is held in place on the set-screw and pulley-hub without the need of screws or other fastening devices.

In practice I prefer to extend the base D beyond the lower parts of the ends of the bag or pouch D in the form of lips d (1, (shown in Figs. 1, 2, and at), so as to increase the base surface of the protector, and thus causing it to cling more firmly to the curved surface of the pulley-hub; but such lips or base extensions may be dispensed with without departing from the essence of my invention.

If it is desired for any reason to remove the protector from the set-screw, this may be done without injury to it simply by taking hold of the rubber bag or its base-piece, and by stretching. and pulling it slightly the perforated base portion may be pulled off from the head of the set-screw and replaced thereon whenever so required.

The invention is verysimple in its construction and is self-fasteningthat is, it can be attached to the screw C without the need of screws, pins, or other equivalent fastening devices. Being elastic it effectually prevents any injury to the operators arm, hand, or body should they be brought in contact with the protector while the hub to which it is erably curved on its exterior portion, it effectually prevents clothing or other objects from being caught on said protector during its rotation.

Having thus fully described the nature, construction, and operation of the invention, I wish to secure by Letters Patent and claim- 1. The improved set-screw protector consisting of a hollow elastic ball or bulb having a perforated base or bottom adapted to be secured on the set-screw, substantially as and for the purpose set forth. 7

2. The improved-set-screw protector consisting of a hollow elastic ball or bulb having a perforated base or bottom adapted to be secured to the set screw and having external base extensions or projections, substantially as and for the purpose set forth.

3. The combination of a shaft, a hub or attached is rotating. Being smooth and prefcollar thereon, and a set-screw for securing name to this specification, in the presence of such parts together, with a guard or shield two subscribing witnesses, on this 5th day of: consisting of iihelluw elastic ball erbulb Imv- August, A. I). 1890.

ing' 2t perforated base adapted to be secured HARRY I "ATJAISIIICY.

5 0n the set-screw, substantially in A manner Witnesses:

as specified. ALBAN J\NDREN,

In testimony whereof I have signed my ALICE A. PERKINS. 

